Loom dobby



March 1 1927.

H. BARDSLEY LOOM BOBBY v Filed March 22, 1925 2 Sheets-Sheet l Y #mi H.BARDSLEY 4 LOOM BOBBY March l 1927.

Filed March 22, 1923 2 Sheets-Sheet 2 Patented Mar. l, i927.

UNETED STAT ortica.

HENRY BARDSLEY, OF PROVDENCE, rtOBE ICELAND, ASSIGNGR TO CROMPTON &KNOV/'LES LOOM WORKS, OF WORCESTER, IvASSACHSETTS, A CORPORATION OFMASSCHUSETTS.

L90M BOBBY.

Application filed March 22, m23. Serial No. 626,841.

rlhis invention relates to a loom dobby. Such dobbies when weavinghandherchiefs or similar fabrics require provision for inserting a crossborder or special design at regular intervals throughout the length ofthe fabric.

My invention relates particularly to that type of dobby in which a mainpattern cylinder is provided for weaving the lengthwise border of the.fabric and an auxiliary pattern cylinder is provided for weaving thebody of the fabric and also the cross border or other special design.

it is the object of my invention to provide improved driving mechanismand controlling devices b y means of' which the auxiliary patterncylinder may be periodically operated as desired.

important features of my invention relate to thev positioning of the twocylinders so that they will rotate about the same axis and to the.provision of suitable driving mechanism for cylinders thus positioned,said mechanism bein g' jointly controlled from the two patterncylinders.

My invention further relates to arrange` ments and combinations of partswhich will be hereinafter described and more particularly pointed out inthe appended claims.

A. preferred form of the invention is shown in the drawings in whichFig. 1 is a front elevation of a dobby enr bodying my improvements;

Fig. 2 is a sectional plan view thereof taken along the line 2-2 in :dig'. 1, and

Fig. 3 is a sectional elevation taken through the cylinders and alongthe line 3 3 in Figs. 1 and 2.

Referring to the drawings, I have shown a loom dobby which is in generalof the usual type and comprises a frame 1() in which is mounted rockinglevers 11 having connections 12 and 13 to the upper and lower lifterbars 14 and 15. Upper and lower dobby hooks 16 and 17 are positioned forengagement by the lifter bars 14 and 15 respectively and are pivotallysupported at the opposite ends of connectors 18 pivoted at 19 to harnessjacks 20. The jacks 2O have an angular movement about a cross rod 21 inthe frame and are held from displacement by a second cross rod 22extending through slots in the jacks. rlhe hooks 16 and 17 are raised orlowered by dobby fingers 23 which, in turn, are positioned by patternchains 24 and 25. The chain 24 is mounted on a main pattern cylinder 26and the chain 25 is mounted on an auxiliary pattern cylinder 27 (Fig.3). The main cylinder 26 is fixed to a shaft 28, one end of which isprovided with a bearing'in the dobby frame 10. The auxiliary cylinder 27is fixed to a sleeve or tube 29 which has a bearing in the opposite sideof the frame 10. 'ihe shaft 28'extends through the sleeve 2.() and isfreely rotatable therein.

fr worm gear 3() is rotatably mounted upon the sleeve 2S) and is engagedby a worm 31 (Fig. 1) on a shaft 32, the worm being preferably of theintermittent type. The worr shaft 32 is continuously rotated tliroughgears 33 and 34 from a driving shaft 35 or in any other suitable manner.

A disc or plate 35 (Fig. 3) is fixed to the shaft 28 and a give-way arm37 is pivoted to said plate and extends through a notch therein. The arm37 is provided with a projecting portion 38 which is yieldingly heldbetween lugs 40 on the side of the gear 30 by a coil spring 41 mountedbetween the 'Eil outer side of the arm 37 and the innerside of a collar42 fixed to the shaft 28. The shaft 28 is thus permanently connected forrotation with the worm gear 8O but can yield relatively thereto if thepattern chain 24 is obstructed in its movements.

Provision is thus made fo-r regularly advancing the cylinder 26 andpattern chain 24 at every revolution of the shaft 32 and worin 81. lwill now describe the connections for periodically actuating theauxiliary cylinder 27. A clutch pin 44 is fixed to a grooved collar 45slidable on the sleeve 2.. and extends through an opening in a plate 46fixed to said sleeve. llvlhen the pin 44 is moved outward, or to theright in F ig. 3, it will enter an opening 47 in the gear 30 and form adriving connection therefrom to the auxiliary pattern cylinder 27.

The clutch pin 44 is positioned by a yoke arm 50 fixed to a rod 51mounted in bearings in the lower portion of the frame 10 and having alever 52 secured to the opposite end thereof. A coil spring 53 isinterposed between a collar 54 on said rod and a fixed bearing 55thereof and tends to yieldingly withdraw the clutch pin 44 fromoperative position.

The lever 52 is connected to a pair of jacks 2Oa and 20h by light chainsor other flexible ilo Jil

connections 56 and 57. `The acls 2Oa and 2()h are controlled by dobbyfingers 255i1 and 23" which may be positioned respectively byprojections on the pattern chains 2li and 25 on the pattern cylinders 26and 2T. Theprojections for the ingers 23a and 23" may be on separatechains on the cylinders instead of on the regular chains if desired, asthe particular means for indicating the movements of the jacks 2()a and20b form no part of my invention, and may be of any usual form.

The operation of my improved multiplier mechanism is as follows 2--Thechains 56 and 57 `are connected to hoollz-shaped projections` on thelower ends of the jacks so that 1n 'n' \,A ment of a jack to the left byits connector 18 will pull the chain upward and correspomlingly swingthe lever 52 upward. Such movement engages the clutch pin lll and startsthe auxiliary pattern cylinder 27. The first advance movement of thepattern chain on the cylinder 27 may be utilized to raise the dobbyfinger 23"', advancing the jack 20h and maintaining the lever 52 inraised position, regardless of the return of the jack 20 to its lowerposition on the next advance movement of the chain 24 on the maincylinder.

The auxiliary pattern cylinder will be held in operation until the jack20b releases the lever 52 so that the spring 53 may yieldingly withdrawthe clutch pin 44. An exceedingly simple mechanism is thus provided forstarting and stopping the auxiliary pattern cylinder.

Havingthus described my invention and the advantages thereof, I do notwish lo be limited to the details herein disclosed otherwise than as setforth in the claims but what I claim is l. In a dobby, a main patterncylinder adapted to control the weave of a portion of the width of afabric and an auxiliary pattern cylinder rotatable about the same axisand adapted to control the weave of the re- Inaining,` portion of thefabric, means to regularly advance the main cylinder', additionaldriving mechanism for periodically advancing the auxiliary cylinder, andmeans jointly controlled by said two pattern cylinders for maintainingsaid additional driving mechanism operative for a determined period.

2. In a dobby, a mainV pattern cylinder adapted to control the weave ofa portion of the width of a fabric and an auxiliary pattern cylinderrotatable about the same' axis and adapted to control the weave of theremaining portion of the fabric, a rotary driving member havingcontinuous engagement with said main cylinder, a clutch between saiddriving member and said auxiliary cylinder, and operatingl devices forsait clutchl jointly controlled by said two cylinders.

3. In a dobby, a main pattern cylinder adapted to control the Weave of aportion of the width of a fabric and an auxiliary pattern cylinderrotatable about the same axis and adapted to control the weave of theremaining portion of the fabric, a rotary driving member havingvcontinuous engagement with said main cylinder, a clutch between saiddriving member and said auxiliary cylinder, a lever connected toposition said clutch', yielding,` means to disengage said clutch, a pairof jacks controlled by said main cylinder and said auxiliary cylinderrespectively, and connectionsfrom said jacks to said lever through whichconnections either jack may move said lever to engage said clutch.

In testimony whereof I have hereunto aiiixed my signature.;

HENRY BARDSLEY.

